Zenas Crocker

US Patent:

44204493, Dec 13, 1983

Filed:

Apr 19, 1982

Appl. No.:

6/369584

Inventors:

Zenas Crocker - Osterville MA
A. Nelson Wright - St. Agathe des Monts, CA

Assignee:

Synergistics Chemicals Limited - Concord

International Classification:

B29C 1902

US Classification:

264 68

Abstract:

A process for producing articles of polytetrafluoroethylene (PTFE) is disclosed. The process allows some of the conventional plastic fabrication techniques to be used with PTFE which until now have not been possible. The process comprises the steps of intensively mixing and thermokinetically heating PTFE resin in an enclosed container with a plurality of blades attached to arms rotating about an axis, with a blade tip speed of at least 30 meters/second, to a predetermined discharge temperature of above 370. degree. C. , discharging the resin at the discharge temperature, forming the resin into a desired shape at a temperature at or below the discharge temperature, holding the resin in the desired shape above a predetermined forming temperature for a predetermined time, and cooling the resin in the desired shape.